ja/Ryubook.pdf: 1914726 rest_router: correct title-lines and an internal-link
ja/html: 1914726 rest_router: correct title-lines and an internal-link
ja/Ryubook.epub: 1914726 rest_router: correct title-lines and an internal-link
ja/Ryubook.mobi: 1914726 rest_router: correct title-lines and an internal-link